For many years, the software Iset-Lab which simulates the dynamical behaviour of lead acid batteries has been in standard use by the automotive and automotive supply industry. The Iset-Lab model includes all relevant physical and electrochemical processes inside a cell. Consequently, only easily available data from manufactures are needed for parameterisation. Iset-Lab is designed as high level language software in C++ and can be integrated in most commercially available simulation environments, for instance Matlab/Simulink or network simulation environments such as Saber or Simplorer. Based on Iset-Lab software, the new software Iset-Lib for the simulation of lithium ion batteries has been developed by Fraunhofer Iwes in Kassel, formerly known as Iset. This presentation describes and compares the software and modelling of lithium ion batteries to that of lead acid batteries. Application of the real time version, as a part of virtual or multi virtual batteries, especially relating to the field of e-mobility, will be outlined. The subject of this contribution is the introduction and description of the software Iset-Lib and the underlying model for simulation of lithium ion batteries. Firstly, the principles of this storage technology and the dynamical behaviour will be explained. Since in the automotive community lead acid batteries have been in use longer and are much better known than lithium ion batteries, the construction and performance of these electrochemical systems will be compared. It should become clear that the dynamics of lithium ion batteries is easier to describe than that of lead acid batteries. However, new challenges arise resulting from the variety of employed substances which are to be found in currently produced batteries. Despite the importance of the mathematical modelling, further implementation features are also of interest. They have no minor significance than the quality of the implemented model itself and therefore will be outlined in short. This will include the design of the interfaces to different simulation environments, the simulation of aged batteries, the determination of initial states, the direct access to input and output variables, accuracy requirements as well as the assembly of many cells to battery aggregates. Further aspects concern real time properties of the software, which are fundamental for its employment in virtual systems. A comparison of a few measurement and simulation results is used to demonstrate some properties of the currently implemented model. The final part of this contribution concerns the construction and employment of virtual batteries which can be regarded as a hardware terminal behaviour simulation of real batteries. Such virtual batteries have many advantages regarding the research and development of hybrid and electric cars. For many years, such systems have been used by the automotive and automotive supply industry as virtual substitutes for starter batteries when investigating complete on-board electrical systems or just peripheral components. There is absolutely no doubt whatsoever that virtual batteries have the potential to shorten development times and costs considerably.


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    Titel :

    Modelling and simulation of lithium ion batteries for hybrid and electric vehicles


    Weitere Titelangaben:

    Modellierung und Simulation von Lithiumion-Batterien für hybride und elektrische Fahrzeuge


    Beteiligte:


    Erscheinungsdatum :

    2010


    Format / Umfang :

    19 Seiten, 8 Bilder, 7 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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